[Jewelry making - Article 00072] - Re: [Orchid] Bergeon ring gauge

[Lois Martens]

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    The numbers on the ring gauge correspond to the length in
    millimeters of metal needed to make that size ring. One must then add
    to this number the thickness of the metal being used. Every size
    change is one millimeter. To go from size 51 to size 49 you must
    remove 2 millimeters. 

Lois Martens
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